Alcohol dehydrogenase 1B is an enzyme that in humans is encoded by the ADH1Bgene.
The protein encoded by this gene is a member of the alcohol dehydrogenase family. Members of this enzyme family metabolize a wide variety of substrates, including ethanol, retinol, other aliphatic alcohols, hydroxysteroids, and lipid peroxidation products. This encoded protein, consisting of several homo- and heterodimers of alpha, beta, and gamma subunits, exhibits high activity for ethanol oxidation and plays a major role in ethanol catabolism. Three genes encoding alpha, beta and gamma subunits are tandemly organized in a genomic segment as a gene cluster.
A single nucleotide polymorphism (SNP) in ADH1B is rs1229984, that changes arginine to histidine at residue 47. The 'typical' variant of this has been referred to as ADH2(1) or ADH2*1 while the 'atypical' has been referred to as, e.g., ADH2(2), ADH2*2, ADH1B*47his, or ADH1B arg47-to-his. This SNP may be related to alcohol consumption with the atypical genotype having reduced risk of alcoholism.
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